Python下安装MySQL驱动出错

Python中安装MySQL时：

pip install mysql-connector

出现下面的报错

Unable to find Protobuf include directory.

----------------------------------------
Command "d:\python\python.exe -u -c "import setuptools, tokenize;__file__='C:\\W
indows\\TEMP\\pip-build-pzmiu_e6\\mysql-connector\\setup.py';exec(compile(getatt
r(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exe
c'))" install --record C:\Windows\TEMP\pip-h0v4sq6o-record\install-record.txt --
single-version-externally-managed --compile" failed with error code 1 in C:\Wind
ows\TEMP\pip-build-pzmiu_e6\mysql-connector\

在stackoverflow里面有人做出额了解答：https://stackoverflow.com/questions/43029672/unable-to-find-protobuf-include-directory
原因是自2.2.3以来会出现这个问题，可以使用2.1.4来避免这个问题：

pip install mysql-connector==2.1.4

2.2.3以后的版本发生了什么变化，提供了什么样的新功能还没有查找到。先将就着用2.1.4吧